ME has always been around and was a studied disease eg Melvin Ramsey was studying it from the 1955 outbreak... Dr Byron Hyde is a more recent ME expert. His site is at
http://www.nightingale.ca/index.php?target=whatis
CFS was something made up in in the 1980s by American government (CDC?) when a syndrome was formed by putting together various illnesses.
ME is a neurological disease which can cause epidemics. CFS isnt necessarily neurological.
..............
"Myalgic Encephalomyelitis (M.E.) is a debilitating neurological disease which has been recognised by the World Health Organisation (WHO) since 1969 as a distinct organic neurological disorder. M.E. is classified in the current WHO International Classification of Diseases with the neurological code G.93.3.
It can occur in both epidemic and sporadic forms, over 60 outbreaks of M.E. have been recorded worldwide since 1934.
M.E. is similar in a number of significant ways to illnesses such as multiple sclerosis, Lupus and Poliomyelitis (polio). Earlier names for M.E. were atypical multiple sclerosis and atypical polio.
What defines M.E. is a specific type of acquired damage to the brain (the central nervous system).
Myalgic Encephalomyelitis is an acutely acquired neurological disease initiated by a virus infection with multi system involvement which is characterised by post encephalitic damage to the brain stem; a nerve centre through which many spinal nerve tracts connect with higher centres in the brain in order to control all vital bodily functions this is always damaged in M.E. (Hence the name 'Myalgic Encephalomyelitis').
The term M.E. was coined in 1956 and means: My = muscle, Algic = pain, Encephalo = brain, Mye = spinal cord, Itis = inflammation. This neurological damage has been confirmed in autopsies of M.E. patients.
Myalgic Encephalomyelitis is primarily neurological, but also involves cognitive, cardiac, cardiovascular, immunological, endocrinological, metabolic, respiratory, hormonal, gastrointestinal and musculo-skeletal dysfunctions and damage. M.E. affects all vital bodily systems and causes an inability to maintain bodily homeostasis. "
the above quote is from a ME site
http://www.ahummingbirdsguide.com/
http://www.hfme.org/meoverview.htm is a good page to read if you want to understand ME from CFS better.
http://www.nightingale.ca/documents/Nightingale_ME_Definition_en.pdf (is Bryon Ramseys ME definition)